33813 Datasheet, PDF (4/54 Pages) Freescale Semiconductor, Inc – One Cylinder Small Engine Control IC

2 Internal Block Diagram
VPWR
VPPREF
VPPSENS
CSB
SI
SCLK
SO
O2HIN
INJIN1
IGNIN1
RIN1
RIN2
MRX
MTX
KEYSW
BATSW
V_CC ^VCC
Pre-
Regulator
LOGIC CONTROL
SPI INTERFACE
& REGISTERS
POR,
Over-voltage
Under-voltage
Watchdog
V_PP
+5.0 V
Tracking
Regulator
+5.0 V
Regulator
Typical of all 6 Driver Outputs
PARALLEL
CONTROL
Gate Control
Current Limit
Temperature Limit
Short/Open
(1 of 6 shown)
SPI Control
Parallel Control
V_PWR
VClamp
lLimit
+
–
R_S
V10.0 Analog
V2.5 Logic
VAnalog
V_Logic
RESETB
VPROT
VCC
INJOUT1
75 µA
ROUT1
ROUT2
LAMPOUT
TACHOUT
INJGND1
INJGND2
RGND1
RGND2
V_CC
ISO9141
CONTROLLER
START LOGIC
SLEEP/RUN
To ROUT2
Driver
Bandgap
Bias
Pre-drivers
Ignition 1
ISO9141
IGNFB1
IGNOUT1
VRSP
VRSN
V_CC
(SPI CONTROL)
VRS CIRCUIT
Oscillator
Divider
Divide by “N”
N=1-32
(SPI)
To Logic
Control
lLimit ₊
–
O2 Heater
To Logic
Control
lLimit
+
–
To TACHOUT Driver
IGNSENSP
IGNSENSN
O2HFB
O2HOUT
O2HSENSP
O2HSENSN
Note: All current sinks and sources ~50µA except where indicated
GND
Figure 2. Simplified Internal Block Diagram
VRSOUT
Analog Integrated Circuit Device Data
Freescale Semiconductor
33813
4